City of Sin (Yanyu Jiangnan) - Vol 1 Chapter 3: Enlightenment

Qin Chuan arrived in a parallel world and got bound to a system.

Ryuk’s life in the forsaken Grade E city was bleak, but it truly shattered when a Knull raid took his last family and left him for dead. On the brink of despair: [System Activation Complete.] [Congratulations, Host has awakened the Draconic Pets Evolution System!] [Welcome host, to the path of domination.] Thrust into Endearth, a shattered mirror of Earth teeming with mythical creatures—vampires, werewolves, cosmic gods—and the unstoppable Knulls, Ryuk sets out on a journey of relentless growth, vengeance, and discovery. But power comes with a price, and the dual nature of his gift could either save humanity or destroy everything. This is a story of evolution, redemption, and defiance. Join Ryuk as he rises from nothing, building unshakable bonds with allies and carving his path in a world where strength is the only currency.

If video game currency is to exchange with real life currency, then it must have a powerful economic entity to guarantee the exchange rate. Furthermore this entity is none other than a country’s government. But why would a government guarantee the ability to exchange video game currency with real life currency?

War can also be fought with currency. Winning victory without firing a shot is a way to topple a country. A game where real money can be exchanged, a super money-making machine. Its name is [Zero] and it is a financial explosion from head to tail.

- Description from Novelupdates

It’s a story about a man who got transported into a novel and possessed a slum boy. He met a noble girl and served her as a butler for 13 Years. Now the girl has already fallen from her noble life and lives in an abandoned mansion with paralyzed legs. Why did she become like that? Of course because she is the villainess in the novel.